Just take any English course and you will find out that a few other verbs such as 'may' do not use the infinitive particle 'to'. For example, 'I may visit my friend anytime.' Every language has some exceptions to the rules. English is my second language as well, and as you MAY KNOW, the grammer is very simple as compared to some other languages. This is the reason why it was chosen as a business language. Easy grammer to learn. Have a lot of fun learning!

"Help" can be followed by either infinitive or a bare infinitive. I don’t know about any difference in meaning.
Help sb [to] do something.
She helped me to cross the road.
She helped me cross the road.